No offense, but all those excuses feel quite ..constructed. The reason advies can't emigrate is for OOC purposes, I assume. It's just one of the drawbacks of choosing the class.
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It's fine tht Advies cannot travel, for some OOC reason. But please don't make up IG excuses for it?
This. +1000.
Contrived arguments like these just lead to long, rambling disagreements and a sense that players in the game aren't really being treated like they have a brain and the ability to reason things through.
If there's a game-play reason, just say "for game play. We don't want advies to have the same abilities as nobles."